REGN DEADLINE ALERT: Faruqi & Faruqi, LLP Reminds Regeneron (REGN) Investors of Securities Class Action Lawsuit Deadline on September 14, 2026

Faruqi & Faruqi, LLP is investigating potential claims against Regeneron Pharmaceuticals, Inc. (NASDAQ: REGN) and reminds investors of the September 14, 2026 deadline to seek the role of lead plaintiff in a federal securities class action that has been filed against the Company.

The complaint alleges that the Company and its executives violated federal securities laws by making false and/or misleading statements and/or failing to disclose the true state of Regeneron's Phase III Fianlimab-Libtayo Study; notably, that its preliminary statistical assumptions were fundamentally flawed, that the active treatment arm was failing to achieve meaningful clinical differentiation over standard therapies, and that the trial would ultimately fail to reach statistical significance on its primary endpoint even without overperformance of the control arm.

On April 29, 2026, Defendants disclosed that the Phase III Fianlimab-Libtayo Study had been altered, expanding the number of patients in the study eligible for "analysis of progression-free survival." On this news, Regeneron's stock price fell $45.41, or approximately 6.2%, to close at $686.36 per share on April 29, 2026.

On May 15, 2026, Regeneron issued a press release announcing that the "Phase 3 Trial of Fianlimab . . . did not reach statistical significance for the primary endpoint of improvement in progression-free survival (PFS)." On this news, Regeneron's stock price fell $68.57, or approximately 9.8%, to close at $629.68 per share on May 18, 2026.

Faruqi & Faruqi, LLP also encourages anyone with information regarding Regeneron's conduct to contact the firm, including whistleblowers, former employees, shareholders and others.